Doubletree



(No Model S. D. BORTELL.

DOUBLETREE.

No. 374,139. Patented Nov. 29, 1887.

Fig.1.

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N. PETERS PhokrLilhognplwr. Wasnmgton, D. (L

UNITED STATES PATENT OF ICE.

SAMUEL D. BORTELL, OF PHILADELPHIA, ASSIGNOR OF ONE-HALF TO W IL- SON B. SOLLIDAY, OF' SOUTH EASTON, PENNSYLVANIA.

DOUBLETREE.

SPECIFICATION forming part of Letters Patent No. 37&,139, dated November 29, 1887.

Application fifed August 4, 1887.

To all whom, it may concern:

Be it known that I, SAMUEL D. BORTELL, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Doubletrees, which improvement is fully set forth in the following specification and accompanying drawings.

My invention relates to improvements in doubletrees designed for use either with two or three horses, as desired; and it consists of improved forms of single and double trees, so

, that the change can be speedily made from one usual clevis, B, and links 0 G for connecting the singletrees D D therewith, the doubletree having two openings, A A. The inner ends of the singletrees near each end are connected with outer ends of the doubletrees by chainlinks or straps A which are employed when three horses are used, in order. to limit the motions of, the singletrees at their inner ends, and thus prevent unequal strain on the parts.

D D D D D D are the tugs, and D the hooks or eyes therefor.

E E are clevis holes or points for attaching the singletrces to the doubletrees,according as is desired to use the apparatus with two or three horses.

It will be observed that the holes E are in the middle of the singletrees,while holes E E are at points onethird the length of the singletree from the inner ends thereof, so as to distribute the power between three horses, as will be hereinafter described.

Having thus described the several parts of my invention, I will now explain its mode of operation.

WVhen arranged, as in Fig. 2, for two horses, the operation is as usual in all old forms of doubletrees and need not be described here. When arranged as in Fig. 1, however, the pull is distributed between three horses. For illustration, suppose each horse to pull five hundred pounds and the lever-arms A and 13 of the singletrees to be for A each two ters Patent, .is

Serial No. 246,120. (No model.)

feet and for l3 each one foot. Then horse one will exert on tug D two hundred and fifty dred and fifty multiplied by one equals two hundred and fifty pounds. Horse two will exert two hundred and fifty pounds on each tug D and D into the arms B equals two hundred and fifty multiplied by one pound, which, added to two hundred and fifty pounds exerted by horse one, makes five hundred pounds on arm B thus balancing the power on arm A So the power from horse two on tug D, with that from horse three on tug D balances the power on arm A of the other singletree, and the poweris transmitted to the equal-arms of the doubletree A,and ultimately to the clevis and load to be pulled.

I am aware that doubletrees arranged for use with either two or three horses are common, and such I do not broadly claim; but the particular construction herein shown and described, wherein the singletrees used in connection with the doubletrees have adouble connection with the said doubletrees, is believed to be new.

Having thus described my invention, what I claim as new, and desire to secure by Let- 1. The doubletree. A, witli h aving the openings A A at each end thereof, in combination with the singletrees D D,each having the openings E E, and the links 0 O and chain-links A, connecting each of said singletrees to said doubletrees.

2. A doubletree, in combination with a singletree and a connecting-link, and chains or links A secured to said single and double tree, substantially as and for the purpose set forth.

3. A doubletree and singletrees, each having two points of attachments for the elevises which connect them and straps or eqivalents at the inner ends of the singletrees and outer ends of the doubletrees for limiting the outward motions of the singletrees at said inner ends, substantially as described.

S. D. BOItTELL.

\Vitnesses:

JAMES F. OKELLY, J can A. WIEDERsHEIM.

clevis B, and 

